A Dominant 9 (A9) Chord Guitar

A dominant 9th anchored by the open A — with the full 3rd.

A dominant 9th (1-3-5-♭7-9) anchored by the open A.
Voiced with the full major 3rd for genuine dominant bite.
The funky, bluesy V chord in the key of D.
A staple of blues and R&B rhythm in A.

Root9th3rd5th7th

Not played

E6th string

FretMuted

Finger—

Root

ABass5th string

FretOpen

Finger—

5th

D4th string

Fret2

Finger1 index

9th

G3rd string

Fret4

Finger4 pinky

3rd

B2nd string

Fret2

Finger1 index

7th

e1st string

Fret3

Finger2 middle

NotesA – E – B – C# – G

Formula1 – 3 – 5 – ♭7 – 9

Voicingx02423

TonesA×1·C#×1·E×1·G×1·B×1

Hear It For Yourself

This chord sounds even better than it looks.

Load A Dominant 9 (A9) onto an interactive fretboard, hear every note, and build it into a progression.

Play A9 in the Studio →

A9 is a premium chord — opening it in the Studio prompts a subscription to unlock full access.

Questions about A Dominant 9 (A9)

What notes are in a A Dominant 9 (A9) chord?

A A Dominant 9 (A9) chord contains the notes A, E, B, C#, G. It is built from the dominant 9th formula 1 - 3 - 5 - ♭7 - 9, with A as the root.

What notes are in an A9 chord?

A9 contains A, C♯, E, G and B — the root, major 3rd, perfect 5th, flat 7th and 9th. It's an A7 (A-C♯-E-G) with the 9th (B) added on top. That major 3rd and flat 7th are what make it a dominant chord, and the added 9th gives it its funky colour.

Embed this chord

Add the A Dominant 9 (A9) diagram to your own site — paste this snippet where you want it to appear.